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These mechanisms rarely displace enough water to trigger transoceanic tsunamis. Violent volcanic explosions, however, can cause global tsunamis<jats:sup>1,5<\/jats:sup>by triggering acoustic-gravity waves<jats:sup>6\u20138<\/jats:sup>that excite the atmosphere\u2013ocean interface. The colossal eruption of the Hunga Tonga\u2013Hunga Ha\u2019apai volcano and ensuing tsunami is the first global volcano-triggered tsunami recorded by modern, worldwide dense instrumentation, thus providing a unique opportunity to investigate the role of air\u2013water-coupling processes in tsunami generation and propagation. Here we use sea-level, atmospheric and satellite data from across the globe, along with numerical and analytical models, to demonstrate that this tsunami was driven by a constantly moving source in which the acoustic-gravity waves radiating from the eruption excite the ocean and transfer energy into it by means of resonance. A direct correlation between the tsunami and the acoustic-gravity waves\u2019 arrival times confirms that these phenomena are closely linked. Our models also show that the unusually fast travel times and long duration of the tsunami, as well as its global reach, are consistent with an air\u2013water-coupled source. This coupling mechanism has clear hazard implications, as it leads to higher waves along land masses that rise abruptly from long stretches of deep ocean waters.<\/jats:p>","DOI":"10.1038\/s41586-022-04926-4","type":"journal-article","created":{"date-parts":[[2022,6,13]],"date-time":"2022-06-13T16:04:48Z","timestamp":1655136288000},"page":"734-740","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":121,"title":["Global Tonga tsunami explained by a fast-moving atmospheric source"],"prefix":"10.1038","volume":"609","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6198-7588","authenticated-orcid":false,"given":"R.","family":"Omira","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2338-5535","authenticated-orcid":false,"given":"R. 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